{
  "manageEntity": {
    "action": "Save",
    "entityId": "338089",
    "entityType": "Track",
    "nonce": "0x3cc645d922032bfb8930ea80e4c7c43ecdd723903d3dc97bbe1826cf161cdac2",
    "signature": "0x4eabba32cca39ae7b2f3b632435bfbc3d6b135e20e5391e81830914d1e8c4a0f34e0250d8193738dc077a83367c9bc1f95217753f9cbb2c1c1dbfe24edc957201b",
    "signer": "0x40aE1C539711FBaE3930131b028D9c764fD8EaCb",
    "userId": "35251"
  }
}